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首页> 外文期刊>Journal of Asian earth sciences >LA-ICP-MS zircon geochronology and platinum-group elements characteristics of the Triassic basalts, SW China: Implications for post-Emeishan large igneous province magmatism
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LA-ICP-MS zircon geochronology and platinum-group elements characteristics of the Triassic basalts, SW China: Implications for post-Emeishan large igneous province magmatism

机译：中国西南三叠纪玄武岩的LA-ICP-MS锆石年代学和铂族元素特征：对峨眉山后火成岩省大型岩浆活动的启示

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摘要

The Triassic post-Emeishan large igneous province (ELIP) basalts, mainly found in the Kaiyuan (KY), Qilin-shan (QLS), and Laochang-Kafang (LK) areas, show spatial and geochemical relationships with the Permian EUP, SW China. Specifically, the post-ELIP basalts are located in the southern part of the intermediate zone of the ELIP. These basalts have major trace element and Sr-Nd isotope features that are similar to those of Permian Emeishan high-Ti basalts. The LA-ICP-MS zircon U-Pb age and whole-rock platinum-group elements (PGE) concentrations of the post-ELIP basalts are reported in this paper. The determined age of 247.7 ± 1.4 Ma for the KY volcanic rocks is almost 10 Ma younger than the termination age of the ELIP magmatism, supporting their origin from post-ELIP magmatism. All the post-ELIP basalts show uniform but significant low PGE contents. Ir and Ru are depleted relative to Rh, Pt, and Pd in the primitive mantle-normalized PGE patterns, suggesting that a low degree of partial melting of the mantle source plays an important role in the PGE characteristics of the post-ELIP basalts. The Ir and Ru contents of the post-ELIP basalts are similar to those of the Emeishan high-Ti basalts. However, the Pt and Pd contents are strikingly depleted. This is consistent with the notion of early extraction of palladium-group PGE during the eruption of the Emeishan basalts.
机译：峨眉山三叠纪后火成岩大省（ELIP）玄武岩主要分布在开元（KY），麒麟山（QLS）和老场-卡芳（LK）地区，显示出与中国西南二叠系EUP的空间和地球化学关系。 。具体而言，后ELIP玄武岩位于ELIP中间带的南部。这些玄武岩具有主要的痕量元素和Sr-Nd同位素特征，与二叠纪峨眉山高钛玄武岩相似。本文报道了后ELIP玄武岩的LA-ICP-MS锆石U-Pb年龄和全岩铂族元素（PGE）浓度。确定的KY火山岩年龄为247.7±1.4 Ma，比ELIP岩浆作用的终止年龄年轻了近10 Ma，这支持了它们来自ELIP后岩浆作用的起源。所有的ELIP后玄武岩均显示出均匀但显着较低的PGE含量。在原始地幔归一化的PGE模式中，Ir和Ru相对于Rh，Pt和Pd耗竭，这表明地幔源的低度部分熔融在ELIP后玄武岩的PGE特性中起着重要作用。 ELIP后玄武岩中的Ir和Ru含量与峨眉山高Ti玄武岩中的Ir和Ru含量相似。但是，Pt和Pd的含量显着减少。这与峨眉山玄武岩喷发过程中尽早提取钯基PGE的观点是一致的。

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  • 来源
    《Journal of Asian earth sciences》 |2014年第15期|69-78|共10页
  • 作者

    Jiawei Zhang; Zhilong Huang; Taiyi Luo; Zaifei Yan;

  • 作者单位

    State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China,University of Chinese Academy of Sciences, Beijing 100049, China;

    State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;

    State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;

    State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;

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  • 正文语种 eng
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  • 关键词

    Platinum-group elements; Geochronology; Low-degree partial melting; Basalts; Emeishan large igneous province; SW China;

    机译：铂族元素;地球年代学;低度部分熔化;玄武岩;峨眉山火成大省;中国西南;

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